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From: Baoquan He <bhe@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, akpm@linux-foundation.org, corbet@lwn.net,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH] mm/page_alloc: Deprecate kernelcore=nn and movable_core=
Date: Wed, 18 Jul 2018 07:31:00 +0800	[thread overview]
Message-ID: <20180717233100.GH1724@MiWiFi-R3L-srv> (raw)
In-Reply-To: <alpine.DEB.2.21.1807171344320.12251@chino.kir.corp.google.com>

On 07/17/18 at 01:46pm, David Rientjes wrote:
> On Tue, 17 Jul 2018, Baoquan He wrote:
> 
> > We can still use 'kernelcore=mirror' or 'movable_node' for the usage
> > of hotplug and movable zone. If somebody shows up with a valid usecase
> > we can reconsider.
> > 
> 
> We actively use kernelcore=n%, I had recently added support for the option 
> in the first place in 4.17.  It's certainly not deprecated.

Thanks for telling. Just for curiosity, could you tell the scenario you
are using kernelcore=n%? Since it evenly spread movable area on nodes,
we may not be able to physically hot unplug/plug RAM.

Thanks
Baoquan
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WARNING: multiple messages have this Message-ID (diff)
From: Baoquan He <bhe@redhat.com>
To: David Rientjes <rientjes@google.com>
Cc: mhocko@kernel.org, linux-kernel@vger.kernel.org,
	linux-mm@kvack.org, akpm@linux-foundation.org, corbet@lwn.net,
	linux-doc@vger.kernel.org
Subject: Re: [PATCH] mm/page_alloc: Deprecate kernelcore=nn and movable_core=
Date: Wed, 18 Jul 2018 07:31:00 +0800	[thread overview]
Message-ID: <20180717233100.GH1724@MiWiFi-R3L-srv> (raw)
In-Reply-To: <alpine.DEB.2.21.1807171344320.12251@chino.kir.corp.google.com>

On 07/17/18 at 01:46pm, David Rientjes wrote:
> On Tue, 17 Jul 2018, Baoquan He wrote:
> 
> > We can still use 'kernelcore=mirror' or 'movable_node' for the usage
> > of hotplug and movable zone. If somebody shows up with a valid usecase
> > we can reconsider.
> > 
> 
> We actively use kernelcore=n%, I had recently added support for the option 
> in the first place in 4.17.  It's certainly not deprecated.

Thanks for telling. Just for curiosity, could you tell the scenario you
are using kernelcore=n%? Since it evenly spread movable area on nodes,
we may not be able to physically hot unplug/plug RAM.

Thanks
Baoquan

  reply	other threads:[~2018-07-17 23:31 UTC|newest]

Thread overview: 16+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-07-17 13:18 [PATCH] mm/page_alloc: Deprecate kernelcore=nn and movable_core= Baoquan He
2018-07-17 13:18 ` Baoquan He
2018-07-17 13:31 ` Michal Hocko
2018-07-17 13:31   ` Michal Hocko
2018-07-17 14:24   ` Baoquan He
2018-07-17 14:24     ` Baoquan He
2018-07-17 14:28     ` Michal Hocko
2018-07-17 14:28       ` Michal Hocko
2018-07-17 20:46 ` David Rientjes
2018-07-17 20:46   ` David Rientjes
2018-07-17 23:31   ` Baoquan He [this message]
2018-07-17 23:31     ` Baoquan He
2018-07-18 20:16     ` David Rientjes
2018-07-18 20:16       ` David Rientjes
2018-07-18 15:10   ` Michal Hocko
2018-07-18 15:10     ` Michal Hocko

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